Fish Passage Site 30303078

Coordinates (dec. deg.): 59.04291°, -158.55295°
Legal Description: S013S056W13
Region: Southwest
Road Name: Aleknagik Lake Road

Datum: NAD83
Quad Name / ITM: Dillingham A-7
AWC Stream #: 325-30-10100-2021
Stream Name: Seven Sisters Creek South Fork

Elevation:

Site Comments: Stream and Watershed name changed to local name on 11.24.21

Survey Date: Sep 21, 2012

Survey SWA12-DIL16

Project Supervisor: Gillian O'Doherty, Alaska Department of Fish and Game — Anchorage, AK
Observers: Gillian O'Doherty, Mark Eisenman

Overall Fish Passage Rating: Red

Tidal: No
Backwatered: No

Step Pools: No
Construction Year:


Site Observations:

  1. Culvert gradient red
  2. Compound gradient in pipe
  3. Inlet perch
  4. Culvert is poorly aligned

Comments: There is a beaver grate made of pipe and chain link fence at inlet. Old beaver dam complex upstream. Unidentified fish observed at outlet. Approx 60 mm in length, possible par marks.

Culvert Measurements

ID: 1 Structure Type: Pipe-arch (Structural steel plate) Fish Passage Rating: Red
 
Length(ft): 102.0
Inlet Type: Projecting
Outlet Type: Projecting
Corrugation Depth(in.): 2.0
Corrugation Width(in.): 6.0
Condition Rating(1-5): 2
Approach Angle: 90.0
Sedimentation At Inlet: Yes
Inlet Substrate: None
Outlet Substrate: None
InletOutlet
Width(ft):5.1 5.1
Height(ft):7.0 7.0
Apron Length(ft):
Water Depth(ft): 2.49
Rustline Height(ft):0.8
Substrate Depth(ft):0.0 0.0
Backwatered?: No
Baffles Present: No
Embedded?: No
Outfall Height: 0.0
Outfall Type: At Stream Grade
Constriction Ratio: 0.98
Culvert Gradient: 2.14%
Max Slope:
Max Slope Length:
  Culvert Observations:
  1. Culvert gradient red
  2. Inlet perch
  3. Compound gradient in pipe
  4. Culvert is poorly aligned

Stream Measurements

Stream SubstratesUpstreamDownstream
Dominant:Silt/ClayGravel
Subdominant:OrganicSand
Stream Slope(deg.):1.6
Stream Flow Stage:Medium
Stream Width Type Distance From
Crossing (ft)		 Stream
Width (ft)
Downstream ordinary high water 73.0 4.30
Downstream ordinary high water 110.0 5.00
Downstream ordinary high water 167.0 6.40

Elevations

Locator ID Culvert
Number		 River
Distance (ft)1		 Distance From
Crossing (ft)2		 Relative
Elevation (ft)
Road Elev 100.00
D/S Grade Ctrl (Thalweg) (head of riffle) 0.00 80.40
D/S Water Surface Elev 0.00 81.13
D/S Grade Ctrl (Thalweg) (head of riffle) 85.00 81.95
D/S Water Surface Elev 85.00 82.49
D/S Tailcrest or 1st Thalweg (tailwater control) 143.00 83.12
D/S Water Surface Elev 143.00 83.65
D/S Water Surface Elev (tailwater surface) 150.00 83.66
Max Pool Depth 150.00 81.37
Outlet Invert (on pipe) 153.00 81.15
Outlet Culvert Top 153.00 83.46
D/S Water Surface Elev 153.00 83.64
Inlet Culvert Top 255.00 88.69
U/S Water Surface Elev (water surface drops through grate) 255.00 83.72
Inlet Culvert Invert (on pipe inside grate) 255.00 83.34
U/S Thalweg 265.00 81.75
U/S Water Surface Elev 265.00 83.87

Notes:

  1. River distance is measured continuously throughout the survey reach along the thalweg of the stream.
  2. Measured from each end of the crossing along the thalweg of the stream.

Fish Sampling Efforts

Gear Type: Visual Observation, Ground (A)
Comments: Undetermined fish of approximately 60 mm with possible parr marks observed at outlet.

Fish Observations

No fish observations occurred during this survey.

Questions or comments about this report can be directed to dfg.dsf.webmaster@alaska.gov